Consumable parts of co-rotating parallel twin-screw extruder
The materials produced by the crusher include fillers such as calcium carbonate and glass fiber, which can accelerate the wear of the screw and barrel of the co-rotating parallel twin-screw extruder. Because the material is not plasticized evenly, or there is metal foreign matter mixed into the material, the torque force of the screw rotation suddenly increases. This torque exceeds the strength limit of the screw of the extruder, and the accident that the screw is twisted is an unconventional accident damage. .
The screw rotates in the barrel, and the friction between the material and the two gradually wears the working surface of the screw and the barrel: the diameter of the screw gradually decreases, and the diameter of the inner hole of the barrel gradually increases. In this way, the matching diameter gap between the screw and the barrel increases little by little with the gradual wear of the two. However, since the resistance of the nose and the manifold in front of the barrel has not changed, this increases the leakage flow of the extruded material forward, that is, the flow of the material from the diameter gap to the feeding direction increases. The result is a drop in extruder throughput. This phenomenon increases the residence time of the material in the barrel, resulting in the decomposition of the material. In the case of polyethylene, the hydrogen chloride gas generated by the decomposition enhances the corrosion of the screw and barrel.
The combined working quality of the two parts, the screw and the barrel, has an important impact on the plasticization of the material, the quality of the product and the production efficiency. When the two parts are seriously worn and the output of the extruder decreases, the maintenance of the screw and barrel should be arranged.
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